4-2-1 Stainless Steel Racing Exhaust Header for 92-93 Acura Integra B18 B18A1 B18B 4-2-1 Design 1.75" Inlet, 2" Outlet O2 sensor insertion and metal gasket included Increase High Flow Air, Gain 10~15 Hp. / Tq. APPLICATION 92-93 Acura Integra LS / RS / GS